The clinical picture of the "cyclical vomiting syndrome" is discussed in the case of a 5 1/2-year-old child. The core symptom of this recurrent disorder is vomiting that occurs in regular cycles and while the patient is in a state of complete well-being, and which is hard to influence. The symptoms, the differential diagnosis, and the therapy of this disorder, which occurs primarily in childhood, are discussed along with the close etiological relationship to infantile migraine. The diagnosis of "psychogenic vomiting" is addressed critically, since it is frequently applied in Germany to disorder pictures that are similar to cyclical vomiting.